CVE-2006-1520: n/a vulnerability

CVE-2006-1520: Format string vulnerability in ANSI C Sender Policy Framework library (libspf) before 1.0.0-p5, when debugg...

Format string vulnerability in ANSI C Sender Policy Framework library (libspf) before 1.0.0-p5, when debugging is enabled, allows remote attackers to execute arbitrary code via format string specifiers, possibly in an e-mail address.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 7, 2024, 17:12 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2006-1520 affects the ANSI C libspf library used for Sender Policy Framework email checks. If debugging is enabled, a crafted email address could trigger a format string flaw and potentially run code on the affected service. The issue is old and conditional, but serious where legacy mail systems still use vulnerable libspf builds. Exposure is most likely in legacy mail filtering, SPF validation, anti-spam, or custom mail-processing systems that still link ANSI C libspf before 1.0.0-p5 and have debugging enabled. Modern exposure cannot be inferred from the provided sources. Treat this as a targeted legacy-infrastructure risk. It is not listed in KEV, but the possible impact is code execution on mail-handling systems. Prioritize confirming whether vulnerable libspf is still present, especially on internet-facing mail infrastructure. Mitigation focus: Inventory mail systems and custom software for libspf usage.; Upgrade libspf to 1.0.0-p5 or later where present.; Disable debugging in any libspf-backed production mail path..

Prepared: Jun 29, 2026, 12:30 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: May 22, 2006, 23:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors

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2Source links

CVSS and timeline data

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Source materials

CVE List V5 sourceCVE List V5
libspf-debugging-format-string(26535)CVE reference · vdb-entry, x_refsource_XF

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

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